#include <cassert>
#include <iostream>

#define BAD_DOUBLE(x) x + x

constexpr int twice(int value) { return value + value; }

int main() {
    const int expanded = 3 * BAD_DOUBLE(1 + 2);
    const int called = 3 * twice(1 + 2);
    int n = 2;
    const int one_evaluation = twice(++n);
    assert(expanded == 8);
    assert(called == 18);
    assert(n == 3 && one_evaluation == 6);
    std::cout << expanded << ' ' << called << ' ' << n << '\n';
}

#undef BAD_DOUBLE